package cn.hrlly.tao2shou.utils;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.display.SimpleBitmapDisplayer;
import com.nostra13.universalimageloader.utils.StorageUtils;

import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;

import cn.hrlly.tao2shou.R;

/**
 * ImageLoader的DisplayImageOptions的配置
 * bitmap进行比例压缩和质量压缩
 * 将bitmap保存成文件
 * User: gengliang
 * Date: 2016-01-18
 * Time: 12:54
 */

public class ImageUtil {

    private static int loadingImage= R.mipmap.loading_image;   //加载时的图片
    private static int emptyUriImage=R.mipmap.fail_image;  //加载错误的图片
    private static int failImage=R.mipmap.fail_image;  //显示错误的图片
    private static boolean isCacheInMemory=true;   //是否缓存到内存
    private static boolean isCacheOnDisc=true;     //是否缓存到SD卡

    public static DisplayImageOptions getOptions(){
        DisplayImageOptions options=new DisplayImageOptions.Builder()
                .showImageOnLoading(loadingImage)
                .showImageForEmptyUri(emptyUriImage)
                .showImageOnFail(failImage)
                .cacheInMemory(isCacheInMemory)
                .cacheOnDisk(isCacheOnDisc)
                .bitmapConfig(Bitmap.Config.RGB_565)
                .imageScaleType(ImageScaleType.EXACTLY)
                .displayer(new SimpleBitmapDisplayer())
                .build();

        return options;
    }

    //比例压缩
    public static Bitmap compBitmapScale(Bitmap image,double height,double width){
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        if( baos.toByteArray().length / 1024>1024) {//判断如果图片大于1M,进行压缩避免在生成图片（BitmapFactory.decodeStream）时溢出
            baos.reset();//重置baos即清空baos
            image.compress(Bitmap.CompressFormat.JPEG, 50, baos);//这里压缩50%，把压缩后的数据存放到baos中
        }
        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
        BitmapFactory.Options newOpts = new BitmapFactory.Options();
        //开始读入图片，此时把options.inJustDecodeBounds 设回true了
        newOpts.inJustDecodeBounds = true;
        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);
        newOpts.inJustDecodeBounds = false;
        int w = newOpts.outWidth;
        int h = newOpts.outHeight;
        //现在主流手机比较多是800*480分辨率，所以高和宽我们设置为
        double hh = height;//这里设置高度为800f
        double ww = width;//这里设置宽度为480f
        //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
        int be = 1;//be=1表示不缩放
        if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放
            be = (int) (newOpts.outWidth / ww);
        } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放
            be = (int) (newOpts.outHeight / hh);
        }
        if (be <= 0)
            be = 1;
        newOpts.inSampleSize = be;//设置缩放比例
        //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了
        isBm = new ByteArrayInputStream(baos.toByteArray());
        bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);
        return compBitmapQuality(bitmap);//压缩好比例大小后再进行质量压缩
    }

    //质量压缩
    public static Bitmap compBitmapQuality(Bitmap image){
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
        int options = 100;
        while ( baos.toByteArray().length / 1024>100) {  //循环判断如果压缩后图片是否大于100kb,大于继续压缩
            baos.reset();//重置baos即清空baos
            options -= 10;//每次都减少10
            image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中
        }
        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中
        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片
        return bitmap;
    }

    //将bitmap保存成文件
    public static File bitmapToFile(Bitmap bitmap,Context context){
        String fileName= String.valueOf(System.currentTimeMillis())+ new Random(1000)+".jpeg";
        File file=new File(StorageUtils.getOwnCacheDirectory(context,"Tao2Shou/Image"),fileName);
        try {
            file.createNewFile();
            BufferedOutputStream bos = null;
            bos = new BufferedOutputStream(new FileOutputStream(file));
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
            bos.flush();
            bos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return null;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
        return file;
    }
}
